过硫酸盐缓释材料释放性能的影响因素研究

运用不同配比制备多种过硫酸盐缓释材料,采用欧盟标准化组织制定的NEN 7375标准浸出方法测试其释放性能,利用相关性分析和克里格插值法探究材料组分配比对过硫酸盐缓释材料释放性能的影响规律.结果表明:作为制备过硫酸盐缓释材料基质材料的水、砂和水泥均有一定的适配范围,即水含量在5%~35%之间,砂含量在0~85%之间,水泥含量在5%~85%之间;缓释材料的扩散系数与砂含量呈现显著的正相关,与水泥含量呈现显著的负相关,而与水含量无显著相关性;基质材料对过硫酸盐缓释材料扩散系数的综合作用较为复杂,总体而言,当水泥含量高于砂含量时,水含量是影响缓释材料扩散系数的主要因素,当砂含量大于水泥含量时,砂含量则是影响缓释材料扩散系数的主要因素.此外,增加缓释材料中过硫酸盐的含量可以提高过硫酸盐的释放速率并延长缓释材料的使用寿命.

Influence factors of the release properties of the slow-release persulfate material

The slow-release persulfate materials were prepared under different component ratios. The release performance was tested according to NEN 7375flume experiment method developed by European Organization for standardization. The influence law of the component materials on the release properties of slow-release persulfate materials was studied by correlation analysis and Kriging interpolation method. Water, sand and cement were the matrix materials for forming slow-release persulfate materials. There was a certain adaption range for each component. The range percentages for water, sand and cement are 5% to 35%, 0% to 85%, and 5% to 85%, respectively. The diffusion coefficients of slow-release persulfate materials had significant positive correlation with sand content. It showed significant negative correlation with cement content and there is no significant correlation with water content. The comprehensive effect of the matrix materials on the diffusion coefficients of slow-release persulfate materials was more complicated. However, the main factor which affecting the diffusion coefficient was water content when cement content was higher than sand content, while cement content was lower than sand content, and then it became sand content. The release speed of slow-release persulfate material would be increased and the release cycle would become longer with the increasing of persulfate content.